BP War: Personnel – Master List BPWN08071702

Notes on the Master List: Index

Page of Notes Contents Column No. in List 1 Overleaf from 2 Index to Notes All Columns 1 Overleaf from 2 Sources 7 2 Overleaf from 1 Surnames, 1 2 Overleaf from 1 Initials, 2 2 Overleaf from 1 Married Names 3 2 Overleaf from 1 Service Ranks, Civilian Grades 4 3 Overleaf from 4 Section / Location Introduction 5 3 Overleaf from 4 External Geographical Locations 5, 6 4 Overleaf from 3 Abbreviations 5, 6 5, 6 Both sides Huts 5, 6 6 Overleaf from 5 Blocks 5, 6 7. Map of , Huts & Blocks 5, 6

Sources, Column 7 of List of Names This Master-List has been compiled by combining the material from a number of War-time contemporary lists, now in the National Archives, together with material gathered in the BP Archives, in particular the Historical Survey Forms:

1: Summer, 1939. Existing GC&CS staff who came to BP in July 1939, & the War Reserve Staff who joined at the outbreak of war in September 1939. (HW3/11; HW14/1; HW14/6, HW50/62; HW64/45)

2: December, 1940. Complete list of BP staff at that date, compiled by the Director’s Office. (HW19/9)

3A: October, 1942. List of Air Section staff at that date, compiled by Air Section directorate. (HW14/57)

3N: 1944 & 1945. List of Naval Section, compiled from duties lists, telephone directories, etc. (HW3/28)

4: 1939 – 1945, Civilian List (All grades down to and including Temporary Assistants). This immediate post- war list was probably intended to be comprehensive & definitive, except that it excluded staff who had continued on to work at GCHQ after the end of the war. (HW14/156)

5: 1939 -1945, Service Lists (The main officer working grade; Navy: Lieut.; Army: Captain; Air-Force: Fl/Lieut.; and the equivalent female Service grades). As with List 4, these three Service lists are comprehensive, except that they exclude officers who had continued on at GCHQ. (HW3/82)

6: Publications, names to be found in the extensive publications about the work of BP.

7: Historical Survey Forms, completed by the veterans and their relatives on visits to the Park in recent years.

9: BP Archive Documents, identified by a serial number in the index held in the BP Archives.

10: ‘Director’s Orders’ & Foreign Office Staff documents held in the BP Archives.

11: Naval Section documents, as 3N above, but from a more extensive set of documents in the BP Archives.

12: ‘Key Personalities’, being notes on individuals at BP, drawn up by archivists from war-time papers & the published literature.

14: Miscellaneous Documents about BP, held in the BP archives

15: Mark Baldwin; Documents, obituaries, etc, available from M. & M. Baldwin of Cleobury Mortimer

16: ; Data collected from Veterans & Visitors over many years by Margaret & Tony Sale

Sources 1, 2, 3, 4, 5 and 11 are to be found in the appropriate file in the National Archives (HW,,/..), with copies held in the BP Archives. Sources 7, 9, 10, 11, 12, and 14 are to be found in the BP Archives, with more detailed reference numbers being available there to identify the particular source document.

In total some 8,700 names appear in this list. We need your help to find the names of people who were at BP in war-time but whose names do not appear in this list, and for corrections to the entries as they appear here. See Overleaf 1 BPWN08071703 BP War: Personnel – Master List

Names, Service/ Civilian Ranks or Grades, Columns 1- 4 Surname, Column 1. This the name used at BP, normally the born name (née) for both men and women, but sometimes a married name for a woman. For a woman who was known at BP by her maiden name, and then after marriage with a new surname at BP, both names may be entered under the appropriate first letter. Initials, Column 2. The contemporary war-time staff lists virtually always list initials, rarely the forenames, so any forenames listed here derive very largely from post-war sources like the Historical Survey Forms. Married Name, Column 3. These give the married name of the particular women when known, normally after marriage in the post-war years. Of course, lack of a listed married name here is certainly no proof that she did not marry in the post-war years.

Service Ranks, Column 4. Grades and ranks are usually given here as recorded in the Source document. Sometimes more than one Rank for Service staff is given, when the individual was promoted during his/her time at BP. The rank that is normally given is that by which the individual would be remembered at BP, for example in the situation where the junior rank is used because the higher rank was received near the end of service at BP. Occasionally an individual received several promotions, in which case the range of ranks, from most junior to most senior, is given. There seems to be considerable confusion about the ranks, and the short- style abbreviations, of the women’s services, even in war-time contemporary documents. Civilian Grades, Column 4. Grades of the civilians are usually given with the highest grade achieved. The common grade for the ‘graduate’ personnel was T.J.A.O., with most achieving promotion to T.S.A.O. after a few years of service. Grades were not a matter of much importance at BP, and were only mentioned very rarely in day-to-day activities. Unfortunately there is considerable confusion in the use of Miss or Mrs, as entries derived from the Historical Survey Forms tend to classify a person who became married after the war as Mrs, when she should be entered as Miss when listed herein under her maiden name at BP. The following Grade abbreviations are used in the List:

Grade Interpretation T.J. A. O. Temporary Junior Assistant Officer. T.J.A.O. was the graduate, or equivalent, entry grade, also used for some undergraduates, etc. Almost all war-time code-breakers started in this grade. T. S. A. O. Temporary Senior Assistant Officer. T.J.A.O.s became T.S.A.O.s after a few years. A very few senior people in pre-war life entered as T.S.A.O.s. T J A. Presumably, this is this the same as T.J.A.O.? T. S. A. Presumably, this is the same as T.S.A.O.s? T. J. A. O. The qualifier seems to indicate special skills of the individual. All the normal codebreakers (D) seem to be in category (D), with certain communications staff in category (C), and certain electronic or radio engineers in category (E). T. A. Temporary Assistant? The grade for non-graduate, non-manual grades, such as typists, secretaries, form-fillers, etc. T. J. S. O. Temporary Junior Scientific Officer? Very occasionally this appears. The new grade of S.O., Scientific Officer, was introduced at the end of the war, rising to S.S.O. (Senior Scientific Officer), and then to P.S.O. (Principle Scientific Officer). C.III. to These seem to be grades employed by the Foreign Office, S.I. S., (as distinct from GC&CS). C.VI. They seem to be grades for radio operators, or for people doing jobs much like T.J.A.O.s, but for those employed by the S. I. S. Linguist Grade used for graduate, or equivalent, translators. Junior Could it be a junior T.A. in permanent (i.e. pre-war) employment? Assistant Senior Very rare; presumably a senior J.A.? Assistant Assistant Standard Civil service grade held, at least pre-war, by senior staff such as Directors of Secretary Establishments. (Post-war it became far less elevated!) A. III ? It seems to be a senior F.O. grade. E(Senior) Is this a mistake for TSAO (E)? Or is it a F.O. grade for an Electronics specialist?

2 £800 These are for really exceptional, very senior individuals who are paid at individually agreed rates. BPWN08071704 BP War: Personnel - Master list

Section / Location, Column 5 of the List

This Column entry lists, in much abbreviated form, the Sections or teams in which the individual worked, together with their locations on site at BP. The material is usually reproduced just as it appears in the Source list, unfortunately often being far from clear. For security reasons in the early days at BP, it was the practise to name a team after the building in which they worked, that name continuing to be used to identify the team even when they had moved to a new location. So in the early days the word ‘Hut’ identifies both the team and the location, but when the word ‘Block’ is used it is only a location. The term Block D(6) means work in Block D in the team known as ‘’ (since that was where that team was first located before they moved to the Block). Sometimes a direct statement of the team is given, such as e.g. ‘Naval Section’ or ‘N.S.’ in which the individual worked. Sometimes the name of the team leader is given, e.g. ‘Twinn’, who was head of ISK, for whom that individual worked. The term ‘N.S VIJ(G)’ means Naval Section (or in the last months it became ‘Naval Wing’), sub-section VI Japanese, with the (G) referring to the team in that sub-section. The entries are supposed to be from the first job in chronological order through to the last at, or shortly after, the end of the war, so that the first entry should be the first in which that individual worked, the last entry the last in which he/she worked on the GC&CS pay-roll. However, there seems sometimes to be a lack of entries for the years before 1942, after which the record keeping became much improved. Sometimes in the Source list from which the information is drawn the location material is limited, such as just ‘’ which probably implies that the individual was a member of the Hut 4 team when it was in Hut 4, and possibly that the individual was still with the Hut 4 team when in Block A, etc

External Geographical Location. Scattered in the entries in the Section Column 5 are abbreviations for geographical locations, whenever the individual moved from the BP site, but still on the BP (or strictly speaking, the GCCS ) strength: A.H. A.H.B.S. Alford House, Park Lane. The location of the Commercial Section on the return of GC&CS (Civil) to in March B.S.A.H., 1942. Also location of ‘B’ Section who worked on ‘political illicit tasks’ such as Russian codes B. B. Broadway Buildings Westminster, London, opposite St James Underground Station. Location of GC&CS and SIS, both of MI5, from 1925 until the transfer to BP in September 1939. B.P. Bletchley Park Rarely to be found in these lists, but used when the individual comes or returns to the Park on a move from some other location during the war. B. S. Berkeley Street, London The main GC&CS location in London, off Piccadilly, during the war. Virtually the whole pre- B. St. war team moved to BP from B.B. during July & August 1939, but the Diplomatic Section B/S returned to B. S. from BP in February or March 1942. C. S. Chesterfield Street, London The main location of the Commercial Section of GC&CS in London, both before the war and on the return from Wavendon in 1942. Also used for the UK’s own codes & cypher construction, so closely associated with the Oxford team. D. P. Drayton Parslow The ‘Tabulating’ team (Hut 7 and Block C) had an outstation at D P. about 4 miles South West from BP , where there were machines working for the Oxford ‘Construction Section’. Most of the senior staff of the Block C Tabulating team lived in a Mansion on this site. Eastcote Eastcote In the North-Western suburbs of London. Initially it became a BP outstation in 1943, growing to become the largest bombe outstation. After the war, some were kept going there, and some tabulating machinery was transferred there from BP. After some months of hesitation over the use of Stanmore, it was decided to concentrate the Service part of GCHQ at Eastcote. This was carried out in April 1946, followed by the Construction team from Oxford in July 1946. The move from Eastcote to Cheltenham took place in the years 1951/1954. Hanslope Hanslope Park 10 miles north of BP. Radio research establishment of MI6. Site of Special Communications Unit H.P. 3) (S.C.U.3) for surveillance of European Diplomatic radio traffic. Post-war site of the Diplomatic Wireless Service, for overseas radio traffic of the Foreign Office. K. H. Keddleston Hall Army Y Station and Intelligence Centre.. M. B. Main Building Normally implicit, not stated, as the core H.Q. location at BP. Especially in the early days, Mansion The Mansion, BP Room Numbers (Rm) , without any other location stated, refer to rooms in the Mansion. Oxford Mansfield College, Oxford The location for the ‘Construction Section’ throughout the war. They were responsible for the construction of the UK’s own codes & cyphers, but reported to the Head of BP, Ryder St. Street near Berkeley St. Specific use uncertain; probably it was used by the S.I. S.? Wavendon Wavendon A small village 3 miles North East of BP, near Woburn Sands, which became a BP outstation virtually at the time of the evacuation from London in July 1939. The Commercial Section from London was based there. It also seems to have been used for teams that needed special security, such as the team working on the Russian codes. In the summer of 1940 it became the designated alternative site for BP in the event of an attack on BP, housing ‘ghost’ teams. It became the first bombe outstation in early 1941. The Commercial team returned to London in March 1942, but work continued at Wavendon, in addition to the bombe team, throughout the war, probably for special security work. W. S. Wavendon School Location at Wavendon used by Commercial Section (and some other purposes, such as the Russian section and a training ‘school’?) S. H School House Elmers School, just outside the BP wire, taken over by BP in 1939. Used for overflow from the Cottage, Hugh Foss’s Japanese work, both Diplomatic and Commercial Sections and the ISOS & ISK Abwehr teams. Note: The word ‘School’ seems also to be used for staff on training courses, not Elmers School-house. School Training Courses Attendance at major training courses, held in BP, at Bedford, & at Wavendon 3 Q. G. Queens Gate Kensington, London, used in immediate post war months for the Historical work. Section / Location, Column 5 – continued BPWN08071704

Abbreviations and Names to be found in the Master list, Column 5:

Abbreviation Meaning Comment AI 4(f) Air Intelligence Branch 4(f) The Air Ministry designation for Air Section at BP, treated as a branch of Air Intelligence AS or A Section Air Section Confusingly, there was also a major sub-section of , sometimes called Air Section of Hut 3 B.O.; Bg.O. Billeting Office Finding living accommodation for the fast growing numbers was a major problem for BP Admin. Comp; Compass. Compassionate (Discharge or Leave) Sometimes given to a girl following a bereavement in her family C. & R. ? Could it be a typographic mistake for CCR or CSR? CCR Cryptographic Coordination & Records Small co-ordination team established by Travis soon after he took over in 1942. Led by Prof V. Vincent C. T. R./ T.O. ?/Traffic Office ? Probably Communications C.S.R. Cypher Security Research Research into security of the UK (or BPs?) own signals in the Hut 14 or Block E Signals Office CCCS Code Construction & Cypher Section Mansfield College, Oxford, L90 ? CM Y Commercial Section Y CMT Cover Management Team? Y station radio-interception cover management? CMY; CMR Cover Management Y Control of the ‘Cover’ provided by the Y stations for the priority keys Consul. Consultant There were a few experts employed as consultants rather than taken full-time onto the BP strength, though they were very rare, because of security considerations D. & R.; D.R. Distribution & Routeing The Diplomatic Sections had long had a mechanism called ‘D & R’ for handling the reporting to the appropriate bodies of the output of their decryption work. In Also found the expansion ‘Direction and 1941 (?) a similar body, under Nigel de Grey, was created for Service Intelligence Registry’ in Hut 3 and then by Frank Birch in N.S. EEI East European section (of Commercial Section?) ? EE/TA ? East European/ Traffic Analysis? E. Engineering? I. C. Intelligence Centre I. E. Intelligence Exchange Team established in 1940 under Nigel de Grey to ensure that the Intelligence coming out of Hut 3 was brought to the attention of the appropriate parts of BP on a ‘need to know’ basis. In 1944 was run by T. F. Higham. At the end of the war was being run by Nigel’s son, John de Grey IS No. IV Or No. 4IS Intelligence School No. IV Cover name given by the War Office to the Military Section or Wing of BP, Or No. 4 School of M.I.8 treated as a War Office body responsible for training cryptographers ISK Intelligence Section Knox The body handling the decryption of Abwehr Enigma signals, at first under Dilly Knox and then Peter Twinn. Both ISOS & ISK reported to Prior ISOS Intelligence Section Oliver Strachey, or Illicit The body, under Oliver Strachey, that handled the decryption of the Abwehr Services Oliver Strachey. (German Intelligence Service) sub-Enigma signals. (Name ‘Illicit’ came from the RSS interception of illicit transmissions within the UK). Denys Page took over from Oliver Strachey in early 1942. They also handled the Intelligence Extraction, etc, functions for all Abwehr signals after decryption. ISSIS Inter-Service Special Intelligence School The name given to the training school established (in Bedford?) in 1941 for Special Intelligence personnel (cryptographers) from all three defence Services and the Foreign Office ISSOS ? J. A. D. 1 Japanese Air D.1?? Assistant Director 1 ? JAFO; Jafo Japanese Forces or Japanese Air Major team for Non-Naval Jap. work. It included work on Army ground and air codes & cyphers JNS Japanese Naval Section Teams working on Japanese Naval codes, including NSIJ, NSIIJ, NS IIIJ, Jessop ? There was a ‘F/Lt R. F. Jessup’ in Air Section in Block F, and then in IE in Hut 4 (?!) Knox Dilly Knox Head of the Cottage Enigma team; usually refers to the team working on Italian Naval Enigma, or the Abwehr Enigma team that became ISK M.C.D. Mechanisation Co-ordination & Direction was appointed the head of the Directorate when it was created Section in Sept.1943 M.S. or Mil Sec. Military Section Mauritius A valuable Y and radio communications station Used by the Diplomatic & Commercial Sections of GCCS. N.S. or N. Sec. Naval Section P.I.D. ? Pritchard Major R. C. Pritchard of Military Section Dick Pritchard. Pre-war recruit, initially working in liaison with the French. Then worked on Japanese military codes. Reiss V. Reiss, in charge of Transport Office Based in the Mansion, then in Hut 2A, then in Hut 9 and finally in Hut 1 Rm Room Usually in the Mansion, unless accompanied by a Block or Hut descriptor. S.; Sec; Sect Section In the early years Section was used for the major teams (Naval, Air, Military). Military Section and Naval Section became Wings in the last months of the war. S.A.C. Security of Allied Cyphers? Most unlikely to be common usage ‘Supreme Allied Command, Europe’ S.O. Signals Office SDO; SO Signals Distribution Office An Office in the Communications Section (Block E). SIAI SI Air Intelligence SIXTA or 6TA or VI.I.S. Six Traffic Analysis Experts on Enemy W/T Communications. SRO Signals Research Office Part of the Communications Centre? TLO Traffic Liaison Officer TMO Transport Maintenance Office Part of Transport Office in Hut 9 and then after March 1943 in Hut 1. WT/CTA Wireless Telegraphy/Cover Traffic Analysis. WTC/TA WT Coordination /Traffic Analysis? Confusingly, there was a Japanese Army ‘Water Transport Code’ 4 WT/CTR WT/ Cover Traffic Records?

Section / Location, Column 5 – cont. BPWN08071704 Huts and Blocks The Huts and Blocks were completed in roughly chronological order as numbered, with some variation due to delays in certain Huts and Blocks for ‘hardening’, etc. There is some overlap with some Huts being completed after some Blocks. Because in the early days, the name of the first Hut a team occupied remained as still their team title when the team moved to another location, the Huts were renumbered when a second team moved into a Hut after the first had left by simply adding a digit; e.g. the physical location became Hut 18. (For location see BP Site-Map).

Name Completed Occupants with Dates Comments Hut 1 Early 1939? Alongside what will be Hut 8, near Hut 6. Probably erected at the time of the Munich Used for Radio Transmitter: Early 1939 – Autumn 1939? Crisis visit in September/ October 1938, or Zygalski sheet preparation: October1939 – January 1940 soon after. Battery charging, First Aid Post: Early 1939 onwards? There is uncertainty about when it became 1st bombe, Victory: March 1940 – March 1942 used for radio receiver/transmitter use, but Hut 6 expansion area, including research team: 1940 – February 1943 this ended soon after GC&CS arrived in July Lavatories, Fire Station: mid-1942 – War End 1939. Annex to Hut 16 (renamed Hut 6) for ISK: March 1943 –Dec 1943 Transport Office (from Hut 9): March 1943 – War End Storage for Air Section records: After End of War Hut 2 August 1939 On what is now the Mansion car-park. Refreshment Hut, (NAAFI?): August 1939 – War End Tea, sandwiches, luncheon voucher sale. Beer Lending Library:: 1939? – May 1942 sales from February 1943! Naval Section Language Evening Classes: 1942 onwards? Emergency Casualty Clearing Station: ? – War End? Demolished, 1986 Hut 3 Summer1940 Close to Hut 6 The first Hut 3 was close to Hut 2, until that Army & Air Sections Enigma Intelligence ‘Hut 3’: first Hut 3 was renamed Hut 9 in summer of July 1940 – February 1943 1940. Service D&R (I.E.), (Nigel de Grey), Hut 3A: Nov 1940 – Sept 1941 I.E., Hut 3A: August 1942 – February 1943 I. E. left for Hut 12 but soon returned when Renamed as Hut 23 in February 1943. Hut 12 was demolished. Hut 4 August?1939 Alongside the South side of the Mansion Probably erected at the time of the Munich Naval (German) Section overflow from the Library in the Mansion: Crisis visit, in September/October 1938 August 1939 – February 1940 Naval (especially Enigma) Intelligence Team ‘Hut 4’: Naval Section moved to Block A and B in February 1940 – Aug.1942. August, Sept.1942 Two Tunny machines emulators (for the ) housed in Hut 4: Tunny machines moved to Hut 11 or Hut15A June 1942 – January 1943 in Jan/Feb 1943. Part of Military Section: August 1942 – ? Part of Japanese Military Section: 1944 WT Coordination /CTR (Cover Traffic Records): From January 1944: Hut 5 Oct. 1939 Close to Hut 4 Military Section overflow from Mansion: Oct 1939 – War end Military Section had occupied the first Hut 3 Naval (French) Section from ? - August 1942. (Hut 9) until January 1940, when displaced Cypher Operators Training School ? – Jan 1943 by the new Enigma Intelligence team before Medical Centre: June 1943 – late 1945 Enigma Intelligence moved to new Hut 3? Balkan Military Section: ? – June 1944 Japanese Military Attaché (JMA) section June 1944 - ? ‘Security of Allied Cyphers’ Sec. (Cmdr Dudley Smith):Nov 1944- End? Hut 6 Jan. 1940? Close to Hut1, 3 and 8 Army & Air Force Enigma decryption team ‘ Hut 6’: ‘Hut 6’ team moved to Block D in Feb.1943 January 1940 – February 1943 Renamed as ‘Hut 16’: March 1943 Occupied by 1SK team in March 1943 Hut 7 May 1940 Close to what would be the end of Block B, near Block C Freddy Freeborn’s team moved into Hut 7 from a The Punched-Card ‘Hollerith’ Machinery Building: building just outside the wire near the main May 1940 – November 1942 entrance gate to the Park. In Nov.1942 they moved Half of Hut 7 retained for Punched Card operators Training School when the on to Block C and Drayton Parslow, except for this machinery mainly moved to Block C: training school Nov 1942 – July ? 1943 Naval Section, cryptography, November 1942 - July 1943 Naval Section IJ deal with cryptography of Naval Section, Japanese Cryptography (NS IJ – Hugh Foss): Japanese Navel cyphers, other than the bulk July 1943 – War End decryption of JN 25 and JN 11. Hut 8 Early 1940 Alongside Hut 1, close to Hut 6 and to West of Block A Naval Enigma Decryption ‘Hut 8’: Feb. 1940 – Feb. 1943 The Hut 8 team moved into Block D(8) Renamed as Hut 18: March 1943 Hut 9 October? 1940 On what is now the Mansion car-park close to the tennis-courts Renamed Hut 9 from first Hut 3, in October? 1940 SIS?: October 1940 – February 1942? WAAF Administration; Japanese Section (Mr Foss) from Hut 8; Service D&R, Italian naval sec overflow: Oct 1940 – February 1942 ISOS: October 1941 – February 1942. 5 Administration Hut: February 1942 – War End ISOS moved to Elmers School

Hut 10 Spring? 1940 Just to the East of Hut 3, alongside Hut 11. Built on the site of the Park’s Maze. Air Section Hut: Spring? 1940 – August 1942 Air Section transferred from the Mansion. Meteorological Section (of Air Sec): 1941? – Aug 1942? Typex Machines: October 1940 - April 1941 Typex machines were used by Air Section, and Codes Section of S.I.S.: August 1942 – March 1945 then Hut 3, & 6 before moving to the Rockex machines installed: May? 1943 Communications section in Block E (also manned Japanese Forces (Jafo) (Mil Sec.): March 1945 –War End by WAAF) Storage of records from Air Section & ISK: August 1945 Hut 11 March 1941 Complex of huts, close to and East of Hut 6, Hut 3 Hut 11, a set of three huts, was built for and has Bombe Hut (Hut 11), March 1941 – Feb. 1942 always been associated with the bombes. Hut 11A Bombe Control Centre (Hut 11A) Feb. 1942- May 1945 housed Agnes, the second prototype bombe, Funf Bombe Operators training Centre (Hut 11B) 1942 – for ISK, and 3 high speed bombes, Panic, Chaos Bombes used by ISK (Hut 11A): Nov. 1942 - War End and Havoc. Hut 11 was called by Wrens ‘The Hell Testery & Newmanry (Tunny & H. Robinson machines): June ‘42-Feb’43 Hole’ Storage and Admin. Office for Wrens (Hut 11B): Feb. 1943 – End Hut 12 August 1941 Temporary small Hut close to the North of Hut 3 Intelligence Exchange (I.E.) (Nigel de Grey):Sept. 1941 – Aug.1942 Re-erected near to Site Entrance, north of Cafeteria Removed to make way for Teleprinter Room. The ‘Education Hut’: April 1943 Retained the Hut 12 designation! October1942 Used in 1944/5 for Chamber Music classes and orchestral evenings. Religious services for R. Catholics and Christian Scientists Army resettlement courses: Mid 1945 - ? Hut 13 Not used Bad luck! Hut 14 Late 1941? Probably east/north-east of Hut 8, close to Blocks A & E Part of the Teleprinter Complex.. Traffic or Cypher Office: Early 1942 – March 1943 T. & C.O. moved to Block E, with which CTR section: Early 1942? Hut 14 was intimately associated. Morse Room of Communications Centre: Early 1942 – Dec. 1943 Comms Centre moved to Block E Hut 15 15A, 15B, & Collection of 4 Huts. close to the North of Hut 3&Hut 10 15C.in early Used by 6IS who worked closely with Hut 3: Early 1942 – 6IS (later ‘Sixta’) came from the Army Y station at 1942. 15D in Feb.1942 Beaumanor. They moved with June/July ‘42 Hut 3 to Block D in Feb. 1943. Hut 16 March 1943 Renamed Hut 6 ISK: March 1943 –September 1943 ISK moved from the Cottage to Hut 16 in March Overflow of Naval Section: September 1943 – war-end? 1943, and on to Block G in Sept.1943 Hut 18 March 1943 Renamed Hut 8. ISOS Abwehr decryption team: March 1943- October 1943 ISOS moved from Elmers School to Hut 18, and Naval Section NS V, Training School: Nov 1943- War end then on to Block G Naval Y station for D-day (E-boats etc): April 1944 – May 1945 ‘Historical’ write-up of BP team: July 1945 – Spring 1946? Hut 20 ? 1942 ? A new Bath-House near southern end of Block F Bath House: August 1942 - ? opened in December 1943. Hut 23 Feb. 1943 Renamed Hut 3 Photographic Section: April – July 1943: Engineering Department: August 1944 - War-end? Bombe technical support staff: January 1944 – War-End. Hut 23A, Barbers Shop: July 1943-War-end

Block A August 1943 North of the Lake, running into the East end of Block B Ground floor, Naval Section: August 1942 – War End Top floor, Air Section: August 1942 – June 1943 Naval Section takes over both floors: June 1943 –War End Air Section moves to Block F Block B Sept. 1943 North-East of the Lake, running into Block A Blocks A & B are, in all essentials, one building. Both floors, Naval Section: Sept 1943 – War End. Block C Nov. 1942 North-East of the lake, across road beyond Block B F. Freeborn’s Hollerith Section moved from Hut 7. Punched Card, Hollerith, Machinery: Nov. 1942 –War End They also had some Hollerith machines at Drayton Parslow. Block D Feb. 1943 North of Blocks A,B, and E The Enigma Army & Air Sections (Huts 3,6, & 8): The Main Block for the Ground and Air warfare in February 1943 – War End Europe. GCHQ retained the Eastern part of the Block until ? 1987 Block E March 1943 Immediately North of Block A The Communications Centre Manned by WAAF. Should be considered as a Second Storey: Cypher Office, Central Signals, Registry and Auto Room, largely from Hut whole complex with Huts 14 and 14A and the Feb.1944 14: February 1943 – War End Teleprinter Hall. Block E was largely concerned Teleprinter Room on 2nd Floor: Feb 1944 – War End. with the BP outgoing signals. White’s Secret Wing, for communication with the USA: Block F July 1943 East of Blocks E, D and G. Air Section in Spur T, 1, 2, 3, 4: Sept 1943 – War End Air Section from Blocks A & B Newmanry in Spur N, Y: November 1943 - Spring 1946 Newmanry moved from Hut 11 Testery in Spur X & W: Sept 1943 – End War Testery from Hut 15A Military Section, Spur 0, P, Q, R, V. May 1944 - End Japanese Military Air Section X & W: ?1943 – May 1944 ‘The Burma Road’ Block G Oct 1943 North of Block D and connected to it in places ISK, ISOS from Huts 18 and 16. Oct/Nov 1943 – War End ISK had moved from the Cottage to Hut 16 in SIXTA from Block D Oct 1943 – March 1943. ISOS moved from Hut 18 Mil. Section, Police sub-sect.? Mil Wing, Jap Forces Section (JAFO?), 1945 – War End Mil. Wing, D.D.M.W. (Col Thompson) & Secretariat, Aug 1945 – End of War Post-war used for GPO Training Establishment. 6 Block H August 1944 East of southern wings of Block F Built purely to house Colossus. In practice used for Newmanry 6 Colossus engaged in Wheel setting.

7